Grandma’s Old-Fashioned Lemon Bars Recipe

If you love classic desserts, this old fashioned lemon squares recipe is for you. With simple pantry ingredients, you can make a tender, buttery shortbread crust topped with a bright, tangy lemon filling. These lemon bars are perfect for tea time, bake sales, showers, holiday gatherings, or any time you want a nostalgic, homemade treat.

Although lemon recipes are often associated with spring and summer, I first remember enjoying these at my grandmother’s kitchen table at Christmas. She loved baking for her family and college students visiting home. Her lemon squares became a favorite and remain a go-to recipe for potlucks, family picnics, bridal and baby showers, and afternoon coffee breaks.

Why You’ll Love This Classic Lemon Bars Recipe

• Classic & Nostalgic – A timeless recipe with the comforting flavors of a buttery shortbread crust and tangy lemon curd.
• Simple Ingredients – Uses basic pantry staples you likely already have on hand.
• Balanced Flavor – The richness of the crust offsets the bright lemon filling for a perfect bite.
• Versatile – Works well for special occasions, casual gatherings, or make-ahead freezer treats.

Ingredients for Lemon Squares

(Exact measurements and the printable recipe card are provided further below.)

For the Shortbread Crust

• All-purpose flour
• Salted cold butter
• Powdered sugar

For the Lemon Filling

• Eggs
• Granulated sugar
• Baking powder
• Salt
• Freshly squeezed lemon juice (fresh is best for bright flavor)

Simple Instructions for Grandma’s Old Fashioned Lemon Squares

This recipe has two parts: the buttery shortbread crust and the lemon curd-style filling. The crust bakes briefly before the lemon filling is poured on and the bars finish baking together.

To Make the Shortbread Crust

1. Preheat the oven to 350°F (175°C). Line an 8 x 8 inch pan with parchment paper, leaving an overhang to lift the finished bars out easily.
2. In a medium bowl, combine the flour and powdered sugar. Cut in the cold, salted butter using a pastry blender, two knives, or your fingertips until the mixture resembles coarse oatmeal.
3. Press the mixture firmly and evenly into the prepared pan. Bake for about 20 minutes, until the edges are lightly golden.

For the Lemon Filling

4. While the crust bakes, whisk together the eggs, granulated sugar, baking powder, salt, and freshly squeezed lemon juice until smooth and well combined.
5. Pour the lemon filling over the hot crust as soon as it comes out of the oven. Return the pan to the oven and bake for an additional 20–25 minutes, or until the center is set and no longer jiggly.
6. Allow the pan to cool completely on a wire rack before removing. Lift the bars from the pan using the parchment overhang and dust with powdered sugar if desired. Cut into 16 squares.

Recipe Card (Quick Reference)

• Yield: 16 squares
• Prep Time: 10 minutes
• Cook Time: 40 minutes
• Total Time: 50 minutes

Helpful Tips for Perfect Old Fashioned Lemon Bars

• Use fresh lemon juice: Bottled juice lacks brightness—freshly squeezed lemons give the best flavor and aroma.
• Keep the butter cold: Chilled butter in the crust helps create a tender, flaky shortbread texture.
• Line the pan with parchment: This makes removal and clean slicing much easier.
• Let them cool completely: Cooling allows the filling to set fully so you get clean, neat squares when you cut them.
• Test for doneness: The filling should be set in the center and not overly wobbly; a gentle jiggle is okay early on but it should finish firm.

Storage and Make-Ahead Tips

Because the filling is custard-like, store lemon bars covered in the refrigerator if they won’t be eaten within a few hours. They keep well for several days chilled. For longer storage, freeze the bars in an airtight container; thaw on the counter before serving. A light dusting of powdered sugar just before serving makes them look extra special.

Variations & Serving Ideas

You can add a thin layer of toasted coconut or chopped pistachios on top for texture, or fold a teaspoon of lemon zest into the filling for extra citrus aroma. Serve with a dollop of whipped cream or a scattering of fresh berries for a bright, elegant dessert plate.

Other Classic Squares & Bars You Might Enjoy

• Graham cracker toffee bars
• Cranberry lemon bars
• Brownies and blondies
• Pecan bars and nut-based bars

Final Notes

These old fashioned lemon squares are an easy, crowd-pleasing dessert with a touch of nostalgia. They freeze and travel well, making them a perfect choice for events where you need a make-ahead sweet. If you try this recipe, consider sharing your results and any small tweaks you made—fresh citrus desserts are always a delight to customize.

Printable Recipe Summary

Ingredients

• 1 cup all-purpose flour
• 1/2 cup salted butter, cold
• 1/4 cup powdered sugar
• 2 eggs
• 1 cup granulated sugar
• 1/2 tsp baking powder
• 1/2 tsp salt
• 2 tablespoons lemon juice (or to taste)

Instructions

1. Preheat oven to 350°F (175°C). Line an 8 x 8 inch pan with parchment paper.
2. Mix flour and powdered sugar. Cut in cold butter until mixture resembles coarse oatmeal. Press into the pan and bake 20 minutes.
3. Whisk eggs, sugar, baking powder, salt, and lemon juice until smooth. Pour over hot crust and bake 20–25 minutes until the center is set.
4. Cool completely on a rack, lift out using parchment, dust with powdered sugar, and cut into 16 squares.

Enjoy these classic lemon bars—simple to make, delightfully bright in flavor, and perfect for sharing.